September is historically the month San Francisco sees the greatest number of new listings come on the market, and this year it hasn’t disappointed! Since the 1st of the month, more than 800 single-family homes and condos have hit the market, blowing last year’s count out of the water. Further sweetening the situation for prospective home buyers, there are more condos for sale now than any time in the past two years and the most sub-million dollar single-family homes …